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NET INTEREST INCOME/EXPENSE (Tables) | 12 Months Ended
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Mar. 31, 2025
Interest Income (Expense), Operating [Abstract] |
Interest Income and Interest Expense Disclosure | Net interest income/expense includes:
| Year ended March 31, 2025 |  | Year ended March 31, 2024 |  | Year ended March 31, 2023
Interest income: |  |  |  |  |
Interest income on trading securities | $ | 378,350 |  |  | $ | 426,428 |  |  | $ | 178,288 |
Interest income on margin loans to customers | 212,360 |  |  | 175,571 |  |  | 34,558 |
Interest income on loans to customers | 207,802 |  |  | 176,539 |  |  | 43,486 |
Interest income on available-for-sale securities | 40,297 |  |  | 32,821 |  |  | 27,003 |
Interest income on reverse repurchase agreements and amounts due from banks | 24,644 |  |  | 16,865 |  |  | 9,836 |
Interest income on held-to-maturity securities | 1,000 |  |  | — |  |  | — |
Other interest income | — |  |  | — |  |  | 1,524 |
Total interest income | $ | 864,453 |  |  | $ | 828,224 |  |  | $ | 294,695 |
Interest expense: |  |  |  |  |
Interest expense on securities repurchase agreement obligations | $ | 340,863 |  |  | $ | 402,665 |  |  | $ | 158,595 |
Interest expense on customer accounts and deposits | 111,541 |  |  | 70,778 |  |  | 40,335 |
Interest expense on margin lending payable | 45,748 |  |  | 16,990 |  |  | 6,635 |
Interest expense on debt securities issued | 36,130 |  |  | 10,356 |  |  | 3,085 |
Interest expense on loans received | 1,568 |  |  | 124 |  |  | 290 |
Other interest expense | 45 |  |  | 198 |  |  | 7 |
Total interest expense | $ | 535,895 |  |  | $ | 501,111 |  |  | $ | 208,947 |
Net interest income | $ | 328,558 |  |  | $ | 327,113 |  |  | $ | 85,748 |

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